21550% is the change from 4 to 866
Calculation steps:
[( 866 - 4 ) ÷ 4] x 100 = 21550%
Formula
Percentage change = [(866 - 4) / 4] x 100
Subtract the new number by the original number
866 - 4 = 862
862 ÷ 4 = 215.5
215.5 x 100 = 21550%
Example